a-a a-b aaa aab aad aak aar aau ab- aba abb abd abk abr abu ad- ada adb add adk adr adu aka akb akd akk akr aku ar- ara arb ard ark arr aru au- aua aub aud auk aur b-u baa bab bad bak bar bau bba bbb bbd bbk bbr bbu bda bdb bdd bdk bdr bdu bka bkb bkk bkr bra brb brd brk brr bru bua bub bud buk bur buu daa dab dad dak dar dau dba dbb dbd dbk dbr dbu dda ddb ddd ddk ddr ddu dka dkb dkk dkr dku dra drb drd drk drr dru dua dub dud duk dur ka- kaa kab kad kak kar kau kba kbb kbd kbk kbr kbu kda kdb kdk kdr kdu kkb kkk kkr kku kra krd krk krr kru kub kud kuk kur kuu ra- raa rab rad rak rar rau rba rbb rbd rbk rbr rbu rda rdb rdd rdr rdu rkb rkk rku rra rrb rrd rrk rrr rru rua rub rud ruk rur ruu ua- uaa uab uad uak uar uau uba ubb ubk ubr ubu uda udb udd udk udr udu uka ukb ukk ukr uku ur- ura urb urd urk urr uru uua uur uuu